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Environmental and Stress Physiology

CO₂ Inhibits Respiration in Leaves of Rumex crispus L. ¹

Department of Agronomy and Range Science, University of California, Davis, California 95616, Department of Vegetable Crops, University of California, Davis, California 95616

Curly dock (Rumex crispus L.) was grown from seed in a glasshouse at an ambient CO₂ partial pressure of about 35 pascals. Apparent respiration rate (CO₂ efflux in the dark) of expanded leaves was then measured at ambient CO₂ partial pressure of 5 to 95 pascals. Calculated intercellular CO₂ partial pressure was proportional to ambient CO₂ partial pressure in these short-term experiments. The CO₂ level strongly affected apparent respiration rate: a doubling of the partial pressure of CO₂ typically inhibited respiration by 25 to 30%, whereas a decrease in CO₂ elicited a corresponding increase in respiration. These responses were readily reversible. A flexible, sensitive regulatory interaction between CO₂ (a byproduct of respiration) and some component(s) of heterotrophic metabolism is indicated.

¹ Supported in part by National Science Foundation grants BSR-8821255 and DCB-89-16637 and U.S. Department of Agriculture grant 88-37264-3857.

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